i830_dma.c

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	BEGIN_LP_RING( 2 );
    	OUT_RING( INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE ); 
	OUT_RING( 0 );
	ADVANCE_LP_RING();

	BEGIN_LP_RING( 6 );
	OUT_RING( CMD_OP_DISPLAYBUFFER_INFO | ASYNC_FLIP );	
	OUT_RING( 0 );
	if ( dev_priv->current_page == 0 ) {
		OUT_RING( dev_priv->back_offset );
		dev_priv->current_page = 1;
	} else {
		OUT_RING( dev_priv->front_offset );
		dev_priv->current_page = 0;
	}
	OUT_RING(0);
	ADVANCE_LP_RING();


	BEGIN_LP_RING( 2 );
	OUT_RING( MI_WAIT_FOR_EVENT |
		  MI_WAIT_FOR_PLANE_A_FLIP );
	OUT_RING( 0 );
	ADVANCE_LP_RING();
	

	dev_priv->sarea_priv->pf_current_page = dev_priv->current_page;
}

static void i830_dma_dispatch_vertex(drm_device_t *dev, 
				     drm_buf_t *buf,
				     int discard,
				     int used)
{
   	drm_i830_private_t *dev_priv = dev->dev_private;
	drm_i830_buf_priv_t *buf_priv = buf->dev_private;
   	drm_i830_sarea_t *sarea_priv = dev_priv->sarea_priv;
   	drm_clip_rect_t *box = sarea_priv->boxes;
   	int nbox = sarea_priv->nbox;
	unsigned long address = (unsigned long)buf->bus_address;
	unsigned long start = address - dev->agp->base;     
	int i = 0, u;
   	RING_LOCALS;

   	i830_kernel_lost_context(dev);

   	if (nbox > I830_NR_SAREA_CLIPRECTS) 
		nbox = I830_NR_SAREA_CLIPRECTS;

	if (discard) {
		u = cmpxchg(buf_priv->in_use, I830_BUF_CLIENT, 
			    I830_BUF_HARDWARE);
		if(u != I830_BUF_CLIENT) {
			DRM_DEBUG("xxxx 2\n");
		}
	}

	if (used > 4*1023) 
		used = 0;

	if (sarea_priv->dirty)
	   i830EmitState( dev );

  	DRM_DEBUG("dispatch vertex addr 0x%lx, used 0x%x nbox %d\n", 
		  address, used, nbox);

   	dev_priv->counter++;
   	DRM_DEBUG(  "dispatch counter : %ld\n", dev_priv->counter);
   	DRM_DEBUG(  "i830_dma_dispatch\n");
   	DRM_DEBUG(  "start : %lx\n", start);
	DRM_DEBUG(  "used : %d\n", used);
   	DRM_DEBUG(  "start + used - 4 : %ld\n", start + used - 4);

	if (buf_priv->currently_mapped == I830_BUF_MAPPED) {
		u32 *vp = buf_priv->kernel_virtual;

		vp[0] = (GFX_OP_PRIMITIVE |
			sarea_priv->vertex_prim |
			((used/4)-2));

		if (dev_priv->use_mi_batchbuffer_start) {
			vp[used/4] = MI_BATCH_BUFFER_END;
			used += 4; 
		}
		
		if (used & 4) {
			vp[used/4] = 0;
			used += 4;
		}

		i830_unmap_buffer(buf);
	}
		   
	if (used) {
		do {
			if (i < nbox) {
				BEGIN_LP_RING(6);
				OUT_RING( GFX_OP_DRAWRECT_INFO );
				OUT_RING( sarea_priv->BufferState[I830_DESTREG_DR1] );
				OUT_RING( box[i].x1 | (box[i].y1<<16) );
				OUT_RING( box[i].x2 | (box[i].y2<<16) );
				OUT_RING( sarea_priv->BufferState[I830_DESTREG_DR4] );
				OUT_RING( 0 );
				ADVANCE_LP_RING();
			}

			if (dev_priv->use_mi_batchbuffer_start) {
				BEGIN_LP_RING(2);
				OUT_RING( MI_BATCH_BUFFER_START | (2<<6) );
				OUT_RING( start | MI_BATCH_NON_SECURE );
				ADVANCE_LP_RING();
			} 
			else {
				BEGIN_LP_RING(4);
				OUT_RING( MI_BATCH_BUFFER );
				OUT_RING( start | MI_BATCH_NON_SECURE );
				OUT_RING( start + used - 4 );
				OUT_RING( 0 );
				ADVANCE_LP_RING();
			}

		} while (++i < nbox);
	}

	if (discard) {
		dev_priv->counter++;

		(void) cmpxchg(buf_priv->in_use, I830_BUF_CLIENT,
			       I830_BUF_HARDWARE);

		BEGIN_LP_RING(8);
		OUT_RING( CMD_STORE_DWORD_IDX );
		OUT_RING( 20 );
		OUT_RING( dev_priv->counter );
		OUT_RING( CMD_STORE_DWORD_IDX );
		OUT_RING( buf_priv->my_use_idx );
		OUT_RING( I830_BUF_FREE );
		OUT_RING( CMD_REPORT_HEAD );
		OUT_RING( 0 );
		ADVANCE_LP_RING();
	}
}


static void i830_dma_quiescent(drm_device_t *dev)
{
      	drm_i830_private_t *dev_priv = dev->dev_private;
   	RING_LOCALS;

  	i830_kernel_lost_context(dev);

   	BEGIN_LP_RING(4);
   	OUT_RING( INST_PARSER_CLIENT | INST_OP_FLUSH | INST_FLUSH_MAP_CACHE );
   	OUT_RING( CMD_REPORT_HEAD );
      	OUT_RING( 0 );
      	OUT_RING( 0 );
   	ADVANCE_LP_RING();

	i830_wait_ring( dev, dev_priv->ring.Size - 8, __FUNCTION__ );
}

static int i830_flush_queue(drm_device_t *dev)
{
   	drm_i830_private_t *dev_priv = dev->dev_private;
	drm_device_dma_t *dma = dev->dma;
   	int i, ret = 0;
   	RING_LOCALS;
	
   	i830_kernel_lost_context(dev);

   	BEGIN_LP_RING(2);
      	OUT_RING( CMD_REPORT_HEAD );
      	OUT_RING( 0 );
      	ADVANCE_LP_RING();

	i830_wait_ring( dev, dev_priv->ring.Size - 8, __FUNCTION__ );

   	for (i = 0; i < dma->buf_count; i++) {
	   	drm_buf_t *buf = dma->buflist[ i ];
	   	drm_i830_buf_priv_t *buf_priv = buf->dev_private;
	   
		int used = cmpxchg(buf_priv->in_use, I830_BUF_HARDWARE, 
				   I830_BUF_FREE);

		if (used == I830_BUF_HARDWARE)
			DRM_DEBUG("reclaimed from HARDWARE\n");
		if (used == I830_BUF_CLIENT)
			DRM_DEBUG("still on client\n");
	}

   	return ret;
}

/* Must be called with the lock held */
void i830_reclaim_buffers(drm_device_t *dev, struct file *filp)
{
	drm_device_dma_t *dma = dev->dma;
	int		 i;

	if (!dma) return;
      	if (!dev->dev_private) return;
	if (!dma->buflist) return;

        i830_flush_queue(dev);

	for (i = 0; i < dma->buf_count; i++) {
	   	drm_buf_t *buf = dma->buflist[ i ];
	   	drm_i830_buf_priv_t *buf_priv = buf->dev_private;
	   
		if (buf->filp == filp && buf_priv) {
			int used = cmpxchg(buf_priv->in_use, I830_BUF_CLIENT, 
					   I830_BUF_FREE);

			if (used == I830_BUF_CLIENT)
				DRM_DEBUG("reclaimed from client\n");
		   	if(buf_priv->currently_mapped == I830_BUF_MAPPED)
		     		buf_priv->currently_mapped = I830_BUF_UNMAPPED;
		}
	}
}

static int i830_flush_ioctl(struct inode *inode, struct file *filp, 
			     unsigned int cmd, unsigned long arg)
{
   	drm_file_t	  *priv	  = filp->private_data;
   	drm_device_t	  *dev	  = priv->head->dev;

	LOCK_TEST_WITH_RETURN(dev, filp);

   	i830_flush_queue(dev);
   	return 0;
}

static int i830_dma_vertex(struct inode *inode, struct file *filp,
		       unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_device_dma_t *dma = dev->dma;
   	drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;
      	u32 *hw_status = dev_priv->hw_status_page;
   	drm_i830_sarea_t *sarea_priv = (drm_i830_sarea_t *) 
     					dev_priv->sarea_priv; 
	drm_i830_vertex_t vertex;

	if (copy_from_user(&vertex, (drm_i830_vertex_t __user *)arg, sizeof(vertex)))
		return -EFAULT;

	LOCK_TEST_WITH_RETURN(dev, filp);

	DRM_DEBUG("i830 dma vertex, idx %d used %d discard %d\n",
		  vertex.idx, vertex.used, vertex.discard);

	if(vertex.idx < 0 || vertex.idx > dma->buf_count) return -EINVAL;

	i830_dma_dispatch_vertex( dev, 
				  dma->buflist[ vertex.idx ], 
				  vertex.discard, vertex.used );

	sarea_priv->last_enqueue = dev_priv->counter-1;
   	sarea_priv->last_dispatch = (int) hw_status[5];
   
	return 0;
}

static int i830_clear_bufs(struct inode *inode, struct file *filp,
			   unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_i830_clear_t clear;

   	if (copy_from_user(&clear, (drm_i830_clear_t __user *)arg, sizeof(clear)))
		return -EFAULT;
   
	LOCK_TEST_WITH_RETURN(dev, filp);

	/* GH: Someone's doing nasty things... */
	if (!dev->dev_private) {
		return -EINVAL;
	}

	i830_dma_dispatch_clear( dev, clear.flags, 
				 clear.clear_color, 
				 clear.clear_depth,
			         clear.clear_depthmask);
   	return 0;
}

static int i830_swap_bufs(struct inode *inode, struct file *filp,
			  unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
   
	DRM_DEBUG("i830_swap_bufs\n");

	LOCK_TEST_WITH_RETURN(dev, filp);

	i830_dma_dispatch_swap( dev );
   	return 0;
}



/* Not sure why this isn't set all the time:
 */ 
static void i830_do_init_pageflip( drm_device_t *dev )
{
	drm_i830_private_t *dev_priv = dev->dev_private;

	DRM_DEBUG("%s\n", __FUNCTION__);
	dev_priv->page_flipping = 1;
	dev_priv->current_page = 0;
	dev_priv->sarea_priv->pf_current_page = dev_priv->current_page;
}

static int i830_do_cleanup_pageflip( drm_device_t *dev )
{
	drm_i830_private_t *dev_priv = dev->dev_private;

	DRM_DEBUG("%s\n", __FUNCTION__);
	if (dev_priv->current_page != 0)
		i830_dma_dispatch_flip( dev );

	dev_priv->page_flipping = 0;
	return 0;
}

static int i830_flip_bufs(struct inode *inode, struct file *filp,
			   unsigned int cmd, unsigned long arg)
{
	drm_file_t *priv = filp->private_data;
	drm_device_t *dev = priv->head->dev;
	drm_i830_private_t *dev_priv = dev->dev_private;

	DRM_DEBUG("%s\n", __FUNCTION__);

	LOCK_TEST_WITH_RETURN(dev, filp);

	if (!dev_priv->page_flipping) 
		i830_do_init_pageflip( dev );

	i830_dma_dispatch_flip( dev );
   	return 0;
}

static int i830_getage(struct inode *inode, struct file *filp, unsigned int cmd,
			unsigned long arg)
{
   	drm_file_t	  *priv	    = filp->private_data;
	drm_device_t	  *dev	    = priv->head->dev;
   	drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;
      	u32 *hw_status = dev_priv->hw_status_page;
   	drm_i830_sarea_t *sarea_priv = (drm_i830_sarea_t *) 
     					dev_priv->sarea_priv; 

      	sarea_priv->last_dispatch = (int) hw_status[5];
	return 0;
}

static int i830_getbuf(struct inode *inode, struct file *filp, unsigned int cmd,
			unsigned long arg)
{
	drm_file_t	  *priv	    = filp->private_data;
	drm_device_t	  *dev	    = priv->head->dev;
	int		  retcode   = 0;
	drm_i830_dma_t	  d;
   	drm_i830_private_t *dev_priv = (drm_i830_private_t *)dev->dev_private;
   	u32 *hw_status = dev_priv->hw_status_page;
   	drm_i830_sarea_t *sarea_priv = (drm_i830_sarea_t *) 
     					dev_priv->sarea_priv; 

	DRM_DEBUG("getbuf\n");
   	if (copy_from_user(&d, (drm_i830_dma_t __user *)arg, sizeof(d)))
		return -EFAULT;
   
	LOCK_TEST_WITH_RETURN(dev, filp);
	
	d.granted = 0;

	retcode = i830_dma_get_buffer(dev, &d, filp);

	DRM_DEBUG("i830_dma: %d returning %d, granted = %d\n",
		  current->pid, retcode, d.granted);

	if (copy_to_user((drm_dma_t __user *)arg, &d, sizeof(d)))
		return -EFAULT;
   	sarea_priv->last_dispatch = (int) hw_status[5];

	return retcode;
}

static int i830_copybuf(struct inode *inode,
			 struct file *filp, unsigned int cmd, unsigned long arg)
{
	/* Never copy - 2.4.x doesn't need it */
	return 0;
}

static int i830_docopy(struct inode *inode, struct file *filp, unsigned int cmd,
			unsigned long arg)
{
	return 0;
}



static int i830_getparam( struct inode *inode, struct file *filp, 
			unsigned int cmd, unsigned long arg )
{
	drm_file_t	  *priv	    = filp->private_data;
	drm_device_t	  *dev	    = priv->head->dev;
	drm_i830_private_t *dev_priv = dev->dev_private;
	drm_i830_getparam_t param;
	int value;

	if ( !dev_priv ) {
		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
		return -EINVAL;
	}

	if (copy_from_user(&param, (drm_i830_getparam_t __user *)arg, sizeof(param) ))
		return -EFAULT;

	switch( param.param ) {
	case I830_PARAM_IRQ_ACTIVE:
		value = dev->irq_enabled;
		break;
	default:
		return -EINVAL;
	}

	if ( copy_to_user( param.value, &value, sizeof(int) ) ) {
		DRM_ERROR( "copy_to_user\n" );
		return -EFAULT;
	}
	
	return 0;
}


static int i830_setparam( struct inode *inode, struct file *filp,
			unsigned int cmd, unsigned long arg )
{
	drm_file_t	  *priv	    = filp->private_data;
	drm_device_t	  *dev	    = priv->head->dev;
	drm_i830_private_t *dev_priv = dev->dev_private;
	drm_i830_setparam_t param;

	if ( !dev_priv ) {
		DRM_ERROR( "%s called with no initialization\n", __FUNCTION__ );
		return -EINVAL;
	}

	if (copy_from_user(&param, (drm_i830_setparam_t __user *)arg, sizeof(param) ))
		return -EFAULT;

	switch( param.param ) {
	case I830_SETPARAM_USE_MI_BATCHBUFFER_START:
		dev_priv->use_mi_batchbuffer_start = param.value;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}


void i830_driver_pretakedown(drm_device_t *dev)
{
	i830_dma_cleanup( dev );
}

void i830_driver_prerelease(drm_device_t *dev, DRMFILE filp)
{
	if (dev->dev_private) {
		drm_i830_private_t *dev_priv = dev->dev_private;
		if (dev_priv->page_flipping) {
			i830_do_cleanup_pageflip(dev);
		}
	}
}

void i830_driver_release(drm_device_t *dev, struct file *filp)
{
	i830_reclaim_buffers(dev, filp);
}

int i830_driver_dma_quiescent(drm_device_t *dev)
{
	i830_dma_quiescent( dev );
	return 0;
}

drm_ioctl_desc_t i830_ioctls[] = {
	[DRM_IOCTL_NR(DRM_I830_INIT)]     = { i830_dma_init,    1, 1 },
	[DRM_IOCTL_NR(DRM_I830_VERTEX)]   = { i830_dma_vertex,  1, 0 },
	[DRM_IOCTL_NR(DRM_I830_CLEAR)]    = { i830_clear_bufs,  1, 0 },
	[DRM_IOCTL_NR(DRM_I830_FLUSH)]    = { i830_flush_ioctl, 1, 0 },
	[DRM_IOCTL_NR(DRM_I830_GETAGE)]   = { i830_getage,      1, 0 },
	[DRM_IOCTL_NR(DRM_I830_GETBUF)]   = { i830_getbuf,      1, 0 },
	[DRM_IOCTL_NR(DRM_I830_SWAP)]     = { i830_swap_bufs,   1, 0 },
	[DRM_IOCTL_NR(DRM_I830_COPY)]     = { i830_copybuf,     1, 0 },
	[DRM_IOCTL_NR(DRM_I830_DOCOPY)]   = { i830_docopy,      1, 0 },
	[DRM_IOCTL_NR(DRM_I830_FLIP)]     = { i830_flip_bufs,   1, 0 },
	[DRM_IOCTL_NR(DRM_I830_IRQ_EMIT)] = { i830_irq_emit,    1, 0 },
	[DRM_IOCTL_NR(DRM_I830_IRQ_WAIT)] = { i830_irq_wait,    1, 0 },
	[DRM_IOCTL_NR(DRM_I830_GETPARAM)] = { i830_getparam,    1, 0 },
	[DRM_IOCTL_NR(DRM_I830_SETPARAM)] = { i830_setparam,    1, 0 } 
};

int i830_max_ioctl = DRM_ARRAY_SIZE(i830_ioctls);

/**
 * Determine if the device really is AGP or not.
 *
 * All Intel graphics chipsets are treated as AGP, even if they are really
 * PCI-e.
 *
 * \param dev   The device to be tested.
 *
 * \returns
 * A value of 1 is always retured to indictate every i8xx is AGP.
 */
int i830_driver_device_is_agp(drm_device_t * dev)
{
	return 1;
}